华中科技大学标准C语言程序设计及应用习题答案

第二章

一.选择题

1.C 2.B D 3.A 4.A 5. D C

6.C 7.D 8.B 9.A 10.D

11.B 12.D 13.C 14.D 15.A

16.B 17.A 18.B

二.判断题

1.错

2.错

3.错

4.错

三.填空题

1. B 66

2. n1=%d\nn2=%d\n

3. 0

四.计算

1

(1) x|y = 0x002f

(2) x^y = 0x0026

(3) x&y = 0x0009;

(4) ~x+~y = 0xffc6

(5) x<<=3 0x0068

(6) y>>=4 0x0002

2

(1) 6

(2) 50

(3) 1

(4) –16

(5) 1

(6) 20

3

(1) 0

(2) 1

(3) 1

(4) 4

(5) 8

(6) 1

4

(1) 12

(2) 0

(3) 1

(4) 27

(6) 6

(7) 24

(8) 27

(9) –29

5

(1) 0

(2) 1

(3) 1

(4) –3

(5) 2

五.程序分析题

程序1

b=20 a=3600

程序2

一.填空题

1.s=6

2.96

3.(1) scanf("%c",&c);

(2) c-32 更好的答案：c-('a'-'A')

2.1

main()

{

int a,b;

printf("please input a & b:");

scanf("%d%d",&a,&b);

printf("\nmax is %d\n",(a>b)?a:b);

}

2.2

int max(int x,int y);

main()

{

int a,b,c,max;

printf("please input a & b & c:");

scanf("%d%d%d",&a,&b,&c);

max=a>b?a:b;

max=c>max?c:max;

printf("\nmax is %d\n",max);

}

2.3 第三章

{

int i=0,sum=0;

while(i<=100)

{

sum+=i;

i++;

}

printf("1+2+3+......+100=%d\n",sum);

}

2.4

main()

{

int i;

int a=10,b=-3;

int c;

printf("%6d%6d",a,b);

for(i=2;i<10;i++)

{

c=3*b+a;

printf("%6d",c);

a=b;

b=c;

}

printf("\n");

}

2.5

main()

{

int i;

while(1)

{

printf("please input a data(0:exit):");

scanf("%d",&i);

if(i==0)

break;

if(i%2==0)

printf("the data %d is a even number.\n",i);

else

printf("the data %d is a odd number.\n",i);

}

}

2.6

#include <stdio.h>

main()

{

int i;

int a=8,b=1;

int sum=0;

for(i=0;i<10;i++)

{

b+=3;

sum += a;

a+=b;

printf("a%8d b:%8d\n",a,b);

}

printf("The Sum Of Is:%d\n",sum);

}

2.7

#include <stdio.h>

main()

{

float x,y;

printf("please input x:");

scanf("%f",&x);

if(x<1.0)

y=x;

else if(x<10)

y=2*x-1;

else

y=3*x-11;

printf("y=%f\n",y);

}

2.8

#include <stdio.h>

main()

{

long a,i,b,a1;

while(1)

{

printf("please input data(1-99999):");

scanf("%ld",&a);

printf("a:%ld\n",a);

if(a<=0||a>=100000)

break;

i=0;

a1=0;

while(a!=0)

{

b=a%10;

printf("%8d",b);

a/=10;

i++;

a1=a1*10+b;

}

printf("\n i:%ld a1:%ld\n",i,a1);

}

}

2.9

#include <stdio.h>

#include <time.h>

#include <stdlib.h>

main()

{

int a,b,i,k=0;

randomize();

a=random(1001);/*create a random data(0-1000)*/

for(i=0;i<20;i++)

{

printf("please guess a number:");

scanf("%d",&b);

if(a>b)

{

k++;

printf("\n%d:Smaller,guess again!\n",k);

}

else if(a<b)

{

k++;

printf("\n%d:Bigger,guess again!\n",k);

}

else

{

printf("\nYou guess right,congraturation!") ;

printf("\nYou have guessed %d times",k);

break;

}

}

if(k==20)

printf("\nsorry,you failed!");

}

2.10

#include <stdio.h>

main()

{

int a,b,c;

int num;

for(a=0;a<10;a++)

{

for(b=0;b<10;b++)

{

for(c=1;c<10;c++)

{

num=a*100+b*10+c;

if((num%3==0)&&(a==5||b==5||c==5))

printf("%8d",num);

}

}

}

printf("\n\n\n");

}

2.11

#include <stdio.h>

main()

{

int i;

int a,b;

printf("please input a,b:");

scanf("%d%d",&a,&b);

for(i=a<b?a:b;i>0;i--)

{

if(a%i==0&&b%i==0)

{

printf("The max=%d",i);

break;

}

}

for(i=a>b?a:b;i>0;i++)

{

if(i%a==0&&i%b==0)

{

printf("\nThe min=%d",i);

break;

}

}

2.12

#include <stdio.h>

main()

{

int a,k=0;

printf("please input data:");

scanf("%d",&a);

while(a%2==0)

{

a=a/2;

k++;

}

printf("\nthe number of factor(2) is %d",k);

}

2.13

main()

{

long i,t=1;

long sum=0;

for(i=1;i<=10;i++)

{

t*=i;

sum+=t;

printf("%ld!=%ld\n",i,t);

}

printf("sum:%ld\n",sum);

}

2.14

#include <stdio.h>

void main()

{

int i,x=0;

for(i=9;i>=1;i--)

{

x=2*(x+1);

}

printf("The first day:%d",x);

}

2.15

#include <stdio.h>

#define PI 3.141593